Penokee Iron Range Trail - Plummer Mine Geologic Layer Cake

Penokee Iron Range Trail - Plummer Mine Geologic Layer Cake (HMUJJ)

Location: Montreal, WI 54550 Iron County
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Country: United States of America
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N 46° 24.458', W 90° 17.581'

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Iron County Heritage Area

Between 1 to 1 1/2 million years ago sediments of slate and cherty iron carbonates were laid down on top of the granite and greenstone bedrock covering this area. Molten lava flowed over the land, seeping into the great cracks on the surface creating "dikes." Then the land was submerged under a great glacial sea and more layers, of sandstone and conglomerate rock, were deposited on top.

A catastrophe tilted this geologic layer cake, standing the rock layers almost on end, at a 65 degree angle to the northwest. At this steep pitch, the layers slipped apart. Rain water seeped between the cracks. Over eons the layers of iron carbonate rock oxidized creating a band of low phosphorus hematite, a highly prized form of iron ore used in making steel.

You are standing above the "footwall" - the geologic intersection of a dike and the southern most edge of the iron formation. Along this edge the greatest concentration of iron ore was found. This underground wealth, created eons ago, spurred the development of the Penokee Iron Range.

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HM NumberHMUJJ
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Marker ConditionNo reports yet
Date Added Sunday, September 21st, 2014 at 2:41pm PDT -07:00
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Locationbig map
UTM (WGS84 Datum)15T E 708059 N 5142901
Decimal Degrees46.40763333, -90.29301667
Degrees and Decimal MinutesN 46° 24.458', W 90° 17.581'
Degrees, Minutes and Seconds46° 24' 27.48" N, 90° 17' 34.86" W
Driving DirectionsGoogle Maps
Area Code(s)715
Closest Postal AddressAt or near 220-224 Jefferson St, Montreal WI 54550, US
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